/**
 * Creates the base structure of file field.
 * @member Ext.form.field.File
 */
@mixin extjs-form-file {

  .#{$prefix}form-file-wrap {
    .#{$prefix}form-text {
      color: #777;
    }

    .#{$prefix}form-file-btn {
      overflow: hidden;
    }

    .#{$prefix}form-file-input {
      position: absolute;
      top: -4px;
      right: -2px;
      height: $form-field-height + 8;
      @include opacity(0);

      /* Yes, there's actually a good reason for this...
       * If the configured buttonText is set to something longer than the default,
       * then it will quickly exceed the width of the hidden file input's "Browse..."
       * button, so part of the custom button's clickable area will be covered by
       * the hidden file input's text box instead. This results in a text-selection
       * mouse cursor over that part of the button, at least in Firefox, which is
       * confusing to a user. Giving the hidden file input a huge font-size makes
       * the native button part very large so it will cover the whole clickable area.
       */
      font-size: 100px;
    }
  }
}